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DLPC350 LED_EN

M.H
Genius 5960 points
Other Parts Discussed in Thread: DLPC350

Hi,

Please tell us about DLPC350.

 

The data sheet(DLPS029C) of DLPC350 has the following description.

 

●See page 27

==========

The DLPC350 controller takes as input 24-, 27-, or 30-bit RGB data at up to 120-Hz frame rate. This frame rate
is composed of three colors (red, green, and blue) with each color equally divided in the 120-Hz frame rate.
Thus, each color has a 2.78-ms time slot allocated.

==========

 

If you use the Video Mode,
It becomes LED_EN of waveform.

 

 

When a corrugation is seen.
An LED of each R/G/B doesn't seem to be 2.78ms.

What should I do understand?

 

Best Regards,

hamada

 

 

  • 0
    TI__Expert 6370 points
    Hello Hamada,

    Video mode is optimized for display purposes to be seen by a human eye. To achieve a natural-looking display, the R, G, and B channels are displayed for different amounts of time because, for example, the human eye is more sensitive to the color green than the color blue.

    This is only the case in video mode. The display time in other modes is the value to which it is set.

    I am going to move your question into the forum that handles DLPC350 topics if you have any followup questions.

    Best regards,
    Trevor
  • 0
    TI__Mastermind 30875 points

    Hello Hamada-san,

    The document explains the basic principle of how the LEDs are manipulated.

    In Video Mode there is a parameter defined which is called as DUTY CYCLE, this explains how the total time is divided in a Video frame time.

    In LightCrafter 4500 DLPC350 controller platform, we have a hard-coded Video Sequence whose DUTY CYCLE is set to Red = 35% Green = 45% and Ble = 20%. So from 8.33ms, the Red LED get 35% - 2.915ms, Green LED get 45% - 3.75ms and Blue LED gets 20% - 1.66ms.

    I hope this explains.

    Regards,
    Sanjeev